The IAQ Procedure is a performance-based ASHRAE 62.1 compliance method that uses continuous indoor air quality monitoring to determine required ventilation rates. Rather than prescriptive formulas, this approach measures actual contaminant levels and adjusts ventilation accordingly. It enables more efficient ventilation strategies while maintaining or exceeding air quality standards.
Monitoring and Control
The IAQ Procedure requires real-time monitoring of carbon dioxide (CO2), particulate matter (PM2.5), volatile organic compounds (VOCs), and other relevant contaminants. Systems automatically modulate outdoor air intake based on measured concentrations, maintaining target thresholds: CO2 at 1,000 ppm above outdoor levels and PM2.5 below 35 micrograms per cubic meter (8-hour average). Demand-controlled ventilation (DCV) systems execute these adjustments through integrated control algorithms.
Implementation Benefits
This procedure reduces energy consumption by eliminating unnecessary over-ventilation during low-occupancy periods while maintaining air quality standards. It requires more sophisticated equipment and commissioning than the Ventilation Rate Procedure. The IAQ Procedure suits variable-occupancy buildings, laboratories, and specialized facilities where occupancy patterns fluctuate significantly. Long-term cost savings often offset higher initial capital and controls investment.